300mA High Efficiency Low Quiescent Current Synchronous Buck … · 2016. 11. 23. · The 34726...

Document Number: MC34726Rev. 2.0, 1/2014

Freescale Semiconductor Advance Information

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300 mA High Efficiency Low Quiescent Current Synchronous Buck Regulator With Z-mode

The 34726 is a high efficiency, low quiescent current (IQ), synchro-nous buck regulator, implementing Freescale’s innovative Z-mode ar-chitecture. Freescale’s Z-mode architecture greatly improves the ripple performance during light load currents, but still maintains a low quies-cent current of 65μA, at no load in “Sleepy” Z-mode.

The 34726 accepts an input voltage in the range of 2.7 to 5.5 V, making it ideally suited for single cell Li-Ion based applications. Factory preset output voltages, ranging from 0.8 to 3.3 V, reduce the number of required auxiliary components. The part is able to provide 300 mA of continuous load current across the input and the output voltage ranges.

The 34726 switches at 2.0 MHz to allow the use of small, surface mount inductors and capacitors to save precious board space.

The 34726 is available in the small, space saving, and low cost, 2x2 UDFN-8 packages. The part is guaranteed for operation over the -25°C to 85°C temperature range.Features• 94% peak efficiency • 2.0 MHz switching frequency• 2.7 to 5.5 V input voltage range• Automatic transition to energy saving light load Z-mode (low ripple)• Fixed output voltage options from 0.8 to 3.3 V• 65 μA quiescent current during sleepy Z-mode• 300 mA maximum continuous output current• Internal 2.0 ms soft start• Thermal and over-current protection• 0.1 μA quiescent current in shutdown (disabled)• Ultra thin 2x2 UDFN package• Pb-free packaging designated by suffix code FC

Figure 1. 34726 Typical Operating Circuit

POWER MANAGEMENT IC

FC SUFFIX (PB-FREE)98ASA10787D

8-PIN UDFN2X2

34726

ORDERING INFORMATION

Device Temperature Range (TA) Package

Refer to Table 1, Device Variations -25°C to 85°C 8-UDFN

Bottom View

VIN

EN

SW

FB

GNDON

OFF

2.7 ~ 5.5V 0.8 - 3.3V *300mA

34726

CIN

COUT

L1

*ProgrammableSee table 1

* This document contains certain information on a new product. Specifications and information herein are subject to change without notice.

© Freescale Semiconductor, Inc., 2008-2010. All rights reserved.

DEVICE VARIATIONS

DEVICE VARIATIONS

Table 1. Device Variations

Freescale Part No. VIN Range Output Voltage(1) Maximum Load Current Switch Frequency (MHz)(2)

MC34726AFC 2.7 - 5.5 V 1.2 V 300 mA 2.0

MC34726BFC 2.7 - 5.5 V 1.8 V 300 mA 2.0

MC34726CFC 3.6 - 5.5 V 3.3 V 300 mA 2.0

MC34726DFC 2.7 - 5.5 V 1.5 V 300 mA 2.0

MC34726EFC 2.7 - 5.5 V 2.5 V 300 mA(3) 2.0

Notes1. Output voltages of: 0.8 V, 0.9 V, 1.0 V, 1.1 V, 1.3 V, 1.4 V, 1.85 V, 2.0 V options available on request. Contact Freescale sales.2. Factory programmable at 2.0 MHz or 4.0 Mhz. Contact Freescale sales for availability of the 4.0 MHz functionality.3. The minimum input voltage must be higher than 2.8 V for 300 mA of load current.

Analog Integrated Circuit Device Data 2 Freescale Semiconductor

34726

INTERNAL BLOCK DIAGRAM

INTERNAL BLOCK DIAGRAM

Figure 2. 34726 Simplified Internal Block Diagram

+–

+–

+–

Buck Controller

UVLO

Thermal Shutdown

Current Limit

Ref.VIN

PWMRef.

Osc.

VINEN

SW (2)

FB

NC GND (2)

InternalRegulator

Soft Start

Analog Integrated Circuit Device Data Freescale Semiconductor 3

34726

PIN CONNECTIONS

PIN CONNECTIONS

Figure 3. 34726 Pin Connections Table 2. 34726 Pin Definitions

A functional description of each pin can be found in the Functional Pin Description section beginning on page 10.

Pin Number Pin Name Pin Function Formal Name Definition

1 VIN Input Supply Voltage Input Power input

2 GND Ground Ground Ground

3 GND Ground Ground Low noise ground

4 EN Input Enable Active high enable input

5 FB Input Feedback Input Feedback of the output voltage

6 NC N/A No Connection Internally not connected. Connect to GND externally

7 SW Output Switching Node This terminal connects to the output inductor

8 SW Output Switching Node This terminal connects to the output inductor

VIN

GND

GND

EN FB

NC

SW

SW

2x2 UDFN-8 (Non EP)

1

2

3

4 5

6

7

8

TransparentTop View


34726

ELECTRICAL CHARACTERISTICSMAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

MAXIMUM RATINGS

Table 3. Maximum Ratings

All voltages are with respect to ground unless otherwise noted. Exceeding these ratings may cause a malfunction or permanent damage to the device.

Ratings Symbol Value Unit

ELECTRICAL RATINGS

All pins voltages VIN, VEN, VFB, VSW

-0.3 to 6.0 V

ESD Voltage(1)

Human Body Model (HBM)Machine Model (MM)

VESD

±2000±200

V

THERMAL RATINGS

Operating Ambient Temperature Range TA -25 to +85 °C

Storage Temperature Range TSTG -25 to +150 °C

Maximum Lead Temperature(2),(3) TPPRT Note 3 °C

Junction TemperatureOperating Junction TemperatureMaximum Junction Temperature

TJ

125+150

°C

Thermal Resistance(4)

Junction-to-CaseJunction-to-Ambient

RθJC

RθJA

104122

°C/W

Power DissipationContinuous (Derate 3.0 mW/°C and over TA = 70°C)

PD

0.5

W

Notes1. ESD testing is performed in accordance with the Human Body Model (HBM) (CZAP = 100 pF, RZAP = 1500 Ω), and the Machine Model

(MM) (CZAP = 200 pF, RZAP = 0 Ω).2. Pin soldering temperature limit is for 10 seconds maximum duration. Not designed for immersion soldering. Exceeding these limits may

cause malfunction or permanent damage to the device.3. Freescale’s Package Reflow capability meets Pb-free requirements for JEDEC standard J-STD-020C. For Peak Package Reflow

Temperature and Moisture Sensitivity Levels (MSL). Go to www.freescale.com, search by part number [e.g. remove prefixes/suffixes and enter the core ID to view all orderable parts. (i.e. MC33xxxD enter 33xxx), and review parametrics.

4. Device mounted on the Freescale EVB test board per JEDEC DESD51-2.


34726

http://www.freescale.com

ELECTRICAL CHARACTERISTICSSTATIC ELECTRICAL CHARACTERISTICS

STATIC ELECTRICAL CHARACTERISTICS

Table 4. Static Electrical Characteristics

Characteristics noted under conditions; 2.7 V ≤ VIN ≤ 5.5 V, 0.8 V ≤ VOUT ≤ 3.3 V, -25oC ≤ TA ≤ 85oC, CIN = COUT = 4.7 μF, L1 = 4.7 μH (See Figure 1), unless otherwise noted. The typical specifications are measured at the following conditions; TA = +25oC, VIN = 3.6 V, fSW = 2.0 MHz with the typical operating circuit (See Figure 1), unless otherwise noted.

Characteristic Symbol Min Typ Max Unit

Supply Voltage VIN 2.7 - 5.5 V

Output Voltage (Factory preset) VOUT 0.8 - 3.3 V

Output Current IOUT 300 - - mA

Total Supply Current(5)

Regulator disabledIDIS

- 0.1 1.0μA

Quiescent Current (Switching)Sleepy Z-mode and ILOAD = 0 mA

IQ- 65 85

μA

Current LimitCurrent rising at high side

IPK

- 450 -mA

Output Voltage Accuracy (% of output voltage)Overload and temperature

ΔVOUT

-3% - 3%VOUT

UVLO Threshold(6)

VIN: 2.7 -5.5 V

VIN rising

VIN falling

VUVLO

-2.5

--

2.7-

V

Enable VoltageRegulator operatingRegulator shutdown

VEN

1.6-

--

-0.4

V

High Side Power MOSFET On ResistanceVIN = 3.6 V, VOUT = 1.8 V, TA = 40°C, ILOAD = 150 mA

RDS(ON)H

- 250 -mΩ

Low Side Power MOSFET On ResistanceVIN = 3.6 V, VOUT = 1.8 V, TA = 40°C, ILOAD = 150 mA

RDS(ON)L

- 350 -mΩ

Load Regulation1.0 mA < ILOAD < 300 mA and VOUT = 1.8 V

ΔVOUT/ΔIOUT

- 0.5 -%

Line RegulationVIN = 2.7 to 5.5 V

ΔVOUT/ΔVIN

- 0.5 -%

Start-up Overshoot (% of output voltage)ILOAD = 0 mA, VOUT = 1.8 V and COUT = 4.7 μF

VSTO

- 3% -VOUT

Thermal Shutdown Threshold (Junction Temperature) TSTDN - 140 - °C

Thermal Shutdown Hysteresis (Junction Temperature) THYSTR - 10 - °C

Notes5. Maximum IDIS measured at VIN = 3.6 V and TA = 25°C.6. For a product with a VOUT of 3.3 V and a VIN minimum less than 3.6 V, the VOUT value will track (drop below 3.3 V) VIN down to a value

of 2.5 V, where the UVLO shutdown mechanism will activate.


34726

ELECTRICAL CHARACTERISTICSDYNAMIC ELECTRICAL CHARACTERISTICS

DYNAMIC ELECTRICAL CHARACTERISTICS

Table 5. Dynamic Electrical Characteristics

Characteristics noted under conditions; 2.7 V ≤ VIN ≤5.5 V, 0.8 V ≤ VOUT ≤3.3 V, -20oC ≤ TA ≤ 85oC, CIN = COUT = 4.7 μF, L1 = 4.7 μH (See Figure 1), unless otherwise noted. The typical specifications are measured at the following conditions; TA = +25oC, VIN = 3.6 V, fSW = 2.0 MHz with the typical operating circuit (See Figure 1), unless otherwise noted.

Characteristic Symbol Min Typ Max Unit

Switching Frequency(7) fSW 1.8 2.0 2.2 MHz

Maximum Duty Cycle(8)

Measured from SW pinDMAX

95 - 100%

Internal Soft-start TimerVOUT Rise Time

tS- 2.0 -

ms

Notes7. fSW can be factory programmed to ±20% of nominal 2.0 MHz.8. The maximum duty limits the range of output voltages achievable for a given input voltage.


34726

ELECTRICAL CHARACTERISTICSELECTRICAL PERFORMANCE CURVES

ELECTRICAL PERFORMANCE CURVES

Figure 4. Efficiency vs. Load CurrentVIN = 3.6 V, VOUT = 1.8 V, TA=25oC

Figure 5. Line RegulationVIN is 2.7 V to 5.5 V and VOUT is 1.8 V, TA=25oC

Figure 6. Load Regulation1.0 mA < ILOAD < 300 mA, VOUT = 1.8 V

Figure 7. Start-up ResponseILOAD = 0 mA, VOUT=1.2 V

Figure 8. Sleepy Z-ModeTM Switching WaveformsVIN = 3.6 V, VOUT = 1.8 V and ILOAD = 1.0 mA

Figure 9. Z-ModeTM Switching WaveformsVIN = 3.6 V, VOUT = 1.8 V and ILOAD = 10 mA

0.1 1 10 100 10000

20

40

60

80

100

Effic

ienc

y (%

)

ILOAD (mA)

VIN=2.7V VIN=3.6V VIN=5.5V

2.5 3.0 3.5 4.0 4.5 5.0 5.5-0.25

0.00

0.25

0.50

0.75

1.00

Line

Reg

ulat

ion

(%)

VIN (V)

ILOAD=0mA ILOAD=100mA ILOAD=300mA

0 50 100 150 200 250 300-0.25

0.00

0.25

0.50

0.75

Load

Reg

ulat

ion

(%)

ILOAD (mA)

VIN=2.7V VIN=3.6V VIN=5.5V

VEN (10 V/DIV)

VOUT (200 mV/DIV)

IL (200 mA/DIV)

Time: 500 μs/DIV

VOUT (1.0 V/DIV)

VSW (2.0 V/DIV)

IL (200 mA/DIV)

Time: 100 μs/DIV

VOUT (1.0 V/DIV)

VSW (2.0 V/DIV)

IL (200 mA/DIV)

Time: 5.0 μs/DIV


34726

ELECTRICAL CHARACTERISTICSELECTRICAL PERFORMANCE CURVES

Figure 10. CCM Switching WaveformsVIN = 3.6 V, VOUT = 1.8 V and ILOAD = 150 mA

Figure 11. Load Transient in Sleepy Z-ModeTM

VIN = 3.6 V, ILOAD =1.0 to 150 mA

Figure 12. Load Transient in Z-ModeTM

VIN = 3.6 V, ILOAD =10 to 300 mA

Figure 13. Load Transient in CCMVIN = 3.6 V, ILOAD = 150 to 300 mA

VOUT (1.0 V/DIV)

VSW (2.0 V/DIV)

IL (200 mA/DIV)

Time: 500 ns/DIV

VOUT (AC Coupled, 500 mV/DIV)

VSW (2.0 V/DIV)

ILOAD (100 mA/DIV)

Time: 200 μs/DIV


VSW (2.0 V/DIV)

ILOAD (200 mA/DIV)

Time: 200 μs/DIV


VSW (2.0 V/DIV)

ILOAD (100 mA/DIV)

Time: 200 μs/DIV


34726

FUNCTIONAL DESCRIPTIONINTRODUCTION

FUNCTIONAL DESCRIPTION

INTRODUCTION

The 34726 is a high efficiency, synchronous, buck regulator, utilizing a voltage mode control architecture with feed forward. It is capable of providing a 300 mA load current for output voltages of 0.8 to 3.3 V, from a single input voltage rail between 2.7 and 5.5 V.

In a buck converter, most of the losses at high output loads are due to conduction losses in the power train, but at light output loads, the conduction losses are reduced and most of the losses become switching losses. Using Freescale’s Z-mode architecture, the 34726, at light output loads, will smoothly transition into a lower switching frequency, thus improving its efficiency.

FUNCTIONAL PIN DESCRIPTION

SUPPLY VOLTAGE INPUT (VIN)2.7 to 5.5 V DC power input. Bypass with a 4.7 μF ceramic

capacitor as close as possible to the VIN and GND pins.

GROUND (GND)Ground.

ENABLE (EN)Active high enable input. EN is over-voltage protected to

6.0 V, independent of the supply voltage. Drive with a logic high signal (or connect to VIN) for normal operation. Drive with a logic low signal, or connect to GND will disable the 34726.

FEEDBACK INPUT (FB)Feedback of the output voltage.

SWITCHING NODE (SW)This terminal connects to the output inductor. The node

internally connects the drain of both high side MOSFET and low side MOSFET.

NO CONNECTION (NC)Internally not connected. Connect to GND externally.


34726

FUNCTIONAL DESCRIPTIONFUNCTIONAL INTERNAL BLOCK DESCRIPTION

FUNCTIONAL INTERNAL BLOCK DESCRIPTION

Figure 14. 34726 Functional Internal Block Diagram

INTEGRATED SUPPLY

INTERNAL REGULATOR AND REFERENCE

The internal regulator and reference block steps down the high input voltage to lower voltage to power all the internal blocks, and provides the reference voltage for the other internal blocks.

OSCILLATORThe oscillator block provides 2.0 MHz clock signal to the

controller.

CONTROLLER

THERMAL SHUTDOWNThe thermal shutdown block monitors the die temperature.

Once the die temperature reaches its threshold, this block turns off the device to prevent the further die temperature rise.

SOFT-STARTThe soft-start block controls the output voltage ramp after

the device is enabled, to limit the in-rush current. The start-up time is internally set to approximately 2.0 ms, and is

independent of input voltage, output voltage, or load current. The soft-start sequence also occurs upon recovery from any fault condition.

UVLOThe UVLO block monitors the input voltage. Once the

input voltage is lower than the falling threshold voltage, this block turns off the device, to avoid unpredictable circuit behavior.

CURRENT LIMITThe current limit block monitors the inductor current. When

the peak inductor current reaches its current limit, this block turns off the high side MOSFET, to prevent the device and external components from damage.

POWER-MOSFET DRIVERThe power-MOSFET-driver block controls the phase of the

diver signals and enhances the drive capability of these.

POWER-MOSFETThe power-MOSFET block contains two power

MOSFETs. One is a PMOS that passes the current from the input to the output, and the other one is an NMOS that provides the inductor current loop when PMOS is turned off.

MC34726 - Functional Block Diagram

Integrated Supply Oscillator MOSFETControl

Integrated SupplyInternal Regulator & Reference

Control

Oscillator

Power MOSFET DriverUndervoltage Lockout

Power MOSFET

Thermal Shutdown Soft Start Current Limit


34726

FUNCTIONAL DEVICE OPERATIONOPERATIONAL MODES

FUNCTIONAL DEVICE OPERATION

OPERATIONAL MODES

Z-MODE OPERATIONThe 34726 operates as a typical fixed frequency, PWM

regulator, at moderate to heavy load currents. As the load is decreased, such that operation transitions from continuous conduction mode (CCM) to discontinuous conduction mode (DCM), the duty cycle is reduced until it approaches 85% of the full load duty cycle. At this point the 34726 transitions into Z-mode operation, where the Z-mode Factor is 0.85. In Z-mode, the regulator skips pulses whenever the duty cycle is

below 85% of the CCM duty cycle. As the load decreases, this pulse skipping reduces the switching frequency and the switching losses thus improving efficiency. For example, if a light load demanded a 30% duty cycle at 2.0 MHz, with Z-mode this same load will require only (0.3/0.85)2 x 2.0 MHz = 0.249 MHz switching frequency, hence switching losses will be reduced by almost ten fold. Figure 15 illustrates the transition to and the exit from Z-mode.

Figure 15. Z-mode Operation

SLEEPY Z-MODE OPERATIONTo improve low current efficiency, the 34726 transitions

into the Sleepy Z-mode at load currents of approximately 1.0 mA and lower. This is accomplished by powering down

internal circuit blocks to lower the device’s quiescent current. Additionally, the oscillator frequency drops to 250 kHz and the low side switch is turned off to emulate the operation of an asynchronous buck converter.

DETAILED FUNCTIONAL DEVICE OPERATION

OVER-CURRENT PROTECTIONThe 34726 implements two layers of protection during

overload conditions. The first is a current limit feature to prevent the device and external components from damage. When the peak inductor current reaches the over-current limit, nominally 450 mA, the high side MOSFET turns off to provide cycle by cycle protection. If the over-current condition persists and the die temperature surpasses the over-temperature protection (OTP) threshold, this second layer of protection shuts down the device.

SHORT-CIRCUIT PROTECTIONWhen a short-circuit condition occurs on the output, typical

regulators will tend to operate at maximum duty cycle. This condition can saturate the inductor and produce severe peak currents, resulting in damage to the device. The 34726 avoids this scenario by detecting output voltages below 0.5 V. Upon detection, the part re-starts continuously until the short circuit condition is removed, or the part surpasses its OTP threshold.

PWM

Z Factor

SWOn Time

PWM_Ref.

VRAMP

VZERR


34726

FUNCTIONAL DEVICE OPERATIONOPERATIONAL MODES

OVER-TEMPERATURE PROTECTIONTo limit its operating temperature, the 34726 shuts down if

the junction temperature of the switching MOSFET surpasses 140°C. If the junction temperature subsequently drops to 130°C, the 34726 restarts.

SOFT-START OPERATIONTo limit the in-rush current, an internal timer controls the

output voltage ramp after the part is enabled. The start-up time is internally set to approximately 2.0 ms and is independent of input voltage, output voltage, or load current.

The soft-start sequence also occurs upon recovery from any fault condition.

UNDER-VOLTAGE LOCK-OUTThe UVLO threshold is set to 2.7 V for rising VIN, and to

2.5 V for falling VIN. For a VOUT of 3.3 V or 2.5 V, the VOUT value will track VIN below 3.6 V or 2.8 V until the 2.5 V falling VIN threshold is reached.

If the UVLO falling threshold is met, the part shuts down and will power-up again with soft-start, when the UVLO rising threshold is surpassed.


34726

TYPICAL APPLICATIONSAPPLICATION INFORMATION

TYPICAL APPLICATIONS

APPLICATION INFORMATION

INPUT CAPACITORThe input capacitor is used to minimize the input voltage

transient that may cause instability when the load transient current is high. Typically a 4.7 μF X5R ceramic capacitor is sufficient for most applications.

OUTPUT CAPACITORFor stable operation and low output voltage ripple, an X5R

ceramic capacitor of 4.7 μF minimum value is needed.

Depending on the load transient current, a larger capacitance may be required.

INDUCTOR SELECTIONA 4.7 μH low DC resistance inductor is typically used for

the 34726 to guarantee the system stable operation.

TYPICAL APPLICATIONS

1.2 V OUTPUT DC/DC CONVERTORFigure 16 shows a typical application using 34726A. CIN

and COUT are typically 4.7 μF/X5R ceramic capacitors. L1 is typically a 4.7 μH low DC resistance inductor. The FB

connects to the output directly for monitoring the output voltage. Normally, the EN pin connects to the input supply directly to enable the regulator.

Figure 16. 1.2 V/300 mA DC/DC Convertor

VIN

EN

SW

FB

GNDON

OFF

2.7 ~ 5.5 V 1.2 V 300 mA

34726A

CIN

4.7 μF

4.7 μH

COUT

4.7 μF

L1


34726

TYPICAL APPLICATIONSPACKAGE DIMENSIONS

PACKAGE DIMENSIONS

For the most current package revision, visit www.freescale.com and perform a keyword search using the “98A” listed below.

FC SUFFIX12-PIN

98ASA10787DREVISION A


34726

http://www.freescale.com


FC SUFFIX12-PIN



34726

REVISION HISTORY

REVISION HISTORY

REVISION DATE DESCRIPTION OF CHANGES

1.0 5/2008 • Initial Release

2.0 9/2009 • Minor adjustments to the Ordering information and Device Variations• Updated to match the current Freescale format and style.

1/2014 • Added archive information


34726

How to Reach Us:

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Web Support:http://www.freescale.com/support

USA/Europe or Locations Not Listed:Freescale Semiconductor, Inc.Technical Information Center, EL5162100 East Elliot Road Tempe, Arizona 85284 1-800-521-6274 or +1-480-768-2130www.freescale.com/support

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Freescale™ and the Freescale logo are trademarks of Freescale Semiconductor, Inc. All other product or service names are the property of their respective owners.© Freescale Semiconductor, Inc. 2010. All rights reserved.

MC34726Rev. 2.01/2014

Information in this document is provided solely to enable system and software implementers to use Freescale Semiconductor products. There are no express or implied copyright licenses granted hereunder to design or fabricate any integrated circuits or integrated circuits based on the information in this document.

Freescale Semiconductor reserves the right to make changes without further notice to any products herein. Freescale Semiconductor makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does Freescale Semiconductor assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation consequential or incidental damages. “Typical” parameters that may be provided in Freescale Semiconductor data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals”, must be validated for each customer application by customer’s technical experts. Freescale Semiconductor does not convey any license under its patent rights nor the rights of others. Freescale Semiconductor products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the Freescale Semiconductor product could create a situation where personal injury or death may occur. Should Buyer purchase or use Freescale Semiconductor products for any such unintended or unauthorized application, Buyer shall indemnify and hold Freescale Semiconductor and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that Freescale Semiconductor was negligent regarding the design or manufacture of the part.

300mA High Efficiency Low Quiescent Current Synchronous Buck … · 2016. 11. 23. · The 34726...

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Transcript of 300mA High Efficiency Low Quiescent Current Synchronous Buck … · 2016. 11. 23. · The 34726...